[pkg/ottl] Define functions using a Factory interface

[evan-bradley]

Description:

This PR creates a Factory interface and uses it to define OTTL function factories.

Summarizing from the issue, the primary goals we have in mind for this interface are:

• Improve the strength of OTTL API types by removing the need for an any type to pass functions to the parser.
• Pass objects initialized by Collector components to functions to be used for things like logging, metrics, etc.
• Provide a path for using optional interfaces to extend function factories in the future.
• Establish standard names for functions to make it easier to keep them consistent across components.

Link to tracking Issue:

Resolves #14712

[runforesight]

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build-and-test duration(14 minutes 24 seconds) has decreased 32 minutes 12 seconds compared to main branch avg(46 minutes 36 seconds).

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✅  check-links workflow has finished in 49 seconds and finished at 10th Apr, 2023.

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⭕  build-and-test workflow has finished in 14 minutes 24 seconds (32 minutes 12 seconds less than main branch avg.) and finished at 10th Apr, 2023.

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[TylerHelmuth]

I like how this looks. Left a couple questions.

[runforesight]

Foresight Summary

    
Major Impacts

build-and-test-windows duration(6 seconds) has decreased 30 minutes 14 seconds compared to main branch avg(30 minutes 20 seconds).

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⭕  build-and-test-windows workflow has finished in 6 seconds (30 minutes 14 seconds less than main branch avg.) and finished at 11th Apr, 2023.

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✅  check-links workflow has finished in 49 seconds and finished at 11th Apr, 2023.

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✅  telemetrygen workflow has finished in 1 minute 19 seconds and finished at 11th Apr, 2023.

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✅  changelog workflow has finished in 2 minutes 24 seconds and finished at 11th Apr, 2023.

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✅  load-tests workflow has finished in 7 minutes 41 seconds (2 minutes 48 seconds less than main branch avg.) and finished at 11th Apr, 2023.

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✅  e2e-tests workflow has finished in 12 minutes 40 seconds and finished at 11th Apr, 2023.

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✅  build-and-test workflow has finished in 38 minutes 14 seconds (8 minutes 28 seconds less than main branch avg.) and finished at 11th Apr, 2023.

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[TylerHelmuth]

Great work, very excited for this!

[MovieStoreGuy]

Spotted a couple things, need to go back a couple times to understand the logic a little more.